Sandpapering-machine.



C. A. LIND. SANDPAPER ING MACHINE.

APPLICATION FILED FEB. 3 1916.

Patented Sept. 25, 1917;

2 SHEETS-SHEET1- e /Zkfl 1M C. A. LIND.

SANDPAPERING MACHINE. APPLICATION FILED FEB. a, 1916.

1,241,407. I Patented Sep a. 25, 1917.

2 SHEETS-SHEET 2.

Zzuenlon Carl 17M?! Aind nnrrnn s PATENT FFEQE.

, CARL AXEL LIND, 0F MINNEAPOLIS, MINNESOTA.

sANDPArERmG-MACHINE;

Specification of Letters Patent.

Patented Sept. 25, 1917.

Application filed February 3, 1916. Serial No. 75,947.

To all whom it may concern: a

, Be it known that I, CARL Axnr. LIND, a

subject ofthe King of Sweden, residing at Minneapolis, in the county of Hennepin and State of Minnesota, haveinvented a new and useful Improvement in Sandpapering-Machines, of which the .following is a specification.

The object of this. invention is the production of a sand papering machine of sim-,

ple and inexpensive construction. Heretofore much annoyance and expense has occurred by the abrasive material such as sand paper wearing and breaking, due to the speed at which it travels, and the curve which it must follow; when mounted upon a belt. Myinventionovercomes this objecl' scribed and claimed;

I 4 is a section of a detail of the belt and In the. drawing forming part of this specification, igure 1v is a side elevation; Fig. 2 is a section upon line XX, Fig. 1; Fig. 3 is a plan of a detail of the belt; Fig.

its immediate cooperating parts; Fig. 5 is a perspective of one of the belt sections,

"Fig.6 is a cross section of one of the belt vertically slidable table B consisting of av bed 2 carrying at its ends belt pulleys 3 v and 4 on shafts 8 and 8. A movable belt 5 passes aroundv the .belt pulleys being driven thereby with its upper side'movably mounted upon a series of antifriction rollers 6, which are journaled in said bed. The

journal blocks such as 7 in which the shaft,

bolts the'tension of the carrying belt 5' can 8 is journaled is slidably mounted in an end of thebed 2- and held adjusted by tightening bolts 9. By the adjustment of these be regulated. The bed with the parts carried thereby is raised and lowered byscrews 1 0,and a system of bevel pinions and shafts l1 and 12, one of said shafts being provided with a hand wheel 13, by the turning of which the height of the table is adjusted and regulated.- The belt 5 is driven at suitable speed to feed the material to be smoothed into'the machine by a drive pulley 13,

shaft 12, pulley .39, belt 40, pulley 41, pulley 41, cross belt 42' and pulley 43, the latter being mounted on the shaft 8' which carries the pulley 4 and journaled in the table 2. A link 44 which is pivoted about shaft 12 has a yoke 44 on its free end in which the pulleys41- and 41 are journaled and com pensates for the adjustment of the table vertically.

Mounted upon the upper portion of the frame A is a sand papering device C, consisting of the following parts. 15 and 16 are pairs ofpulleys respectively mounted and carried by shafts 17 and 18, the shafts 17 being journaled inpillar blocks 19,

which are integral with the frame A and the shaft 18 being journaled in movable pillar blocks 20' which I are slidably mounted in said frame and held in adjusted position by the tightening bolts 21 by the adjustment of which the belt D passing around the pulleys 15 and 16 can be regulated in tension. The belt D consists of a series of sections of the same size and shape resembling bars such as 21-fiexibly united by links 22. Each of said bars is made in two sections, the upper section 23 thereof being secured'to the lower section 24 by screws 25. The two sections 23 and 24 are formed with a series of evenly spaced cavities 26, openings thereinto. extending from each of the two opposite sides 27 and 2 8 of the bar. The upper surface of each cavity is formed with a downwardly projecting shoulder 29 while they lower surface below said shoulder is slanted down in a gentle curve 30 toward the adjacent side of the bar. The cavities 26 of each bar are arranged with their shoulders and curved surfaces referred to alternating, that is the shoulder and curved surface of one cavity faces outwardly toward one side of the bar, while the next adjacent cavity in said bar has its shoulder and curved surface facing toward the opposite side of said bar. The adjacent bars of the belt have their shoulders and cooperating curved surfaces corresponding, so that I a llnk such as 22 engaging one shoulder in one. of the cavities will extend forwardly over the curved surface 30 and engage a v shoulder in the corresponding cavity of they adjacent bar. Thus the sections of the belt inwardly in the form of a depression 32 in the lap of which a key. 331s loosely-held back in the shoulder 29, there being a key "held by each hook member back of the corresponding shoulders of a pair of bars of the l. belt. This construction produces a flexible coupling 'bctweenthe sections of the I b'elt,=permitting the 'belt'to travel evenly" around-the curved surfaces of thepulleys 15and'l6. The adjacent sides 27 and28 of? each'p'air of bars onthe belt diverge inwardly apart, thus allowing thesecti'ons of the belt to conform freely with the, outer surfaces'of the pulleys 15 and 16 as the belt I travels around them.

couplingscan be suspended in the openings 4 of thebars'of the belt by scre'ws46 mov'ably rial without stretching it unevenly any time during its course over the flat sides and end curved surfaces of the belt. The outer sur-i; ,faces of the sections of the belt are also curved,'so that the sand papering belt will 35 without uneven stretching and becoming broken. The curves 30 it will be noted permit the lower surfaces of the links 22 to body of i the sand papering' belt maybe work freely in the cavities of the bars. *The I made out of any. suitable flexible material usually constructed, the belt being made of endless construction .by uniting its ends together or otherwise, and then being placed over the pulleys 15 and 16 and tightened.

Power is transmitted to the supporting belt D by means'of a pulley 35,"belt36 and p'ul ley 37 the pulley 35 being mounted upon the shaftlS and the pulley '37 on theshaft 12.

The lower side 'of the sand papering belt lies substantially horizontal and at suit able regulated height above the bed 2and substantially p arallel, with the upper side of the carrierbelt 5. In use the height. of the 'bed 2'andits cooperating parts isregulatedi in combination, a.m'ainframe,a table adjustby turning the handle 13 and power applied to the machine by the-main drive pulley '13. "The material which is to have its surface smoothed is passed into the bite of the 'lower'side of the sand paperbelt 34E,

and the upper side of the carrier belt on the W'hen desired the sand papering belt and the carrier ,belt, the

surface of said material is smoothed evenly "without undulyrwearing the sand papering material due to its contact with the body of the belt D;

I In-accordance with th'e patent statutes, I

; have-'descr-ibed the principles of operation of my invention, together with" the apparatuswhich I now consider tore-present the best embodimentthereof, but I desire to have it understood that "the construction shown is only illustrative, andthat-the in vention-can be carried out by othervmeans and applied to uses other than -those above set forthwithin' the scope of the following claims.

Having described my'inventi'on what I claim as newyand' desire-'toi'protect by Letpassing through slots 47 in the 'bars into I one'end of each coupling. The upper and lower sides of the belt are held taut by said pulleys-and carry the abrasive belt 34: made out of sand paper or-"other suitable mateters Patent-- is: v j

'1. A sand p aperin'g'machine,comprising, in-combination, a'qnain frame, a table ,adjustable in elevation'uponsa-id frame, a feed belt-having a fiat side traveling 'over the surface ofsaid table, a supporting belt liav a flat sidetraveling adjacent to the hat SIC e "of sa'idfeed belt and an endless band of abrasive material" carried by SELlCl'JSHP- v p poi-ting belt, said supporting belt consisting conform evenly and smoothly over the mam beltas it travels around the curved ends without any uneven stretching? A sand papering machine, comprising,"

in combination, a mainframe, aj'table adjustablysupported in elevation upon said "from which belts of this character are frame, a feed belt'having a fiat' side travel- 'ingyover'the'surface of said table, a series which the fiatside "of said belt travels, a supporting belt having a flatlside traveling adjacent to the flatside of said feed belt and 'anendless band of abrasive material carried .by said supporting belt, said supporting belt consisting of a :series "of trans- 'v'erse'bars linked freely together, each bar having clearancexsurfaces, whereby the abrasive belt is carried without: any uneven stretching.

I A sand papering machine, comprising,

ably-supported inelevation upon said frame, a feed belt'movably mountedupon said table and having a flat side traveling over the surface of'sa'id'table, means operative from a singleha nd device for raising and lowering said table,a supporting belt having. a'- fiat side adj acent to the fiatside of said. feed belt," an endless ba'ndof abrasive material carried by said supporting belt, means for clearance surfaces, whereby the abrasive belt driving said belts With their adjacent sides is carried by said supporting belt Without in the same direction and at different speeds, any uneven stretching. 10 said supporting belt consisting of a series of In testimony whereof, I have signed my transverse bars freely linked together, each name to this specification.

bar having a convex outer surface and each pair of adjacent bars having adjacent side CARL AXEL LIND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

